Chain saw sharpener



Sept. 19,` 1950 B. F. PITCHER 2,522,799

CHAIN SAW SHARPENER Filed June l5, 1949 2 Sheets-Sheet l j l; /6' @fd-; INVENTOR. -1 "1 i il: B. fi, P1707: er

f BY y /BMM ATTORNEYS Sept. 19, 1950 B. F. PITCHER 2,522,799

` CHAIN sAw SHARPENER 2 Sheets-Sheet 2 T. 7. 7fy 5 1 Filed June 15, 1949 /6 20/9 zz z/ I G l xml;

/0 5/ {"f" INVENTOR. .5. EPZ' ZF6/zer' ATTORNEYS Patented Sept. 19, 1950 UNITED STATES `O F F ICE `CHAIN saw sHARPEnsa A l Benjamin 1F. Pitcher, oheboygan, Mich.:` Application June 1,5, 1949, SerialfNo.` 99,197`

"Ihisinvention relates to chain saw sharpeners.

An object of this invention is'to provide a chain saw sharpener which will sharpen the saw' while onthe saw frame, and which will also permit setting and gauging of the teeth, including both the cutting and the raker teeth.

Another object ofthis invention is to provide a sharpener ofthis kind which includes a frame adapted tolbe clamped to the saw frame and guide, and anadjustable file carrier which is adjustable relative tothe saw teeth so that the latter will be ,evenlyA sharpened along the tops thereof as the chain moves under the file, and the set of the `teeth can be gauged so that the teeth can be accurately set. LA further object of this invention is to provide a device of this kind including an attachment whereby the raker teeth can be sharpened and also gauged.

A further object of this invention is to pro- 1 vide a deviceof this kind which is simplein construction and can ybe easily and quickly mounted on the saw structure without alteration of the latter.

With the above and other objects in view, my invention consists in the arrangement, combination and details of construction disclosed in the drawings and specification, and then more particularly pointed out in the appended claims.

In the drawings,

Figure l is a plan View of a device for use in sharpening and setting of chain saws, constructed according to an embodiment of this invention,

Figure 2 is a detail side elevation of the device,

Figure 3 is a sectional view taken on the line 3--3 of Figure 1,

Figure 4 is a sectional view4 taken on the line 4-4 of Figure 1,

Figure 5 is a plan view, partly broken away, of a raker tooth gauge and tiling guide,

Figure 6 is a detail side elevation, partly broken away and in section, of a raker tooth gauge and filing guide,

Figure 7 is a sectional View taken on the line 'I-I of Figure 6,

Figure 8 is a sectional view taken on the line 8-8 of Figure 3.

Referring to the drawings, the numeral ID designates generally an inverted U-shaped frame embodying an upper bight II and parallel side members I2 and I3. The frame ID is adapted to be secured to a fixed portion of a chain saw structure and preferably the chain guide I4 over which the chain I5 slidably engages.

The frame I 0 has adjustably mounted between the sides I2 and I3 thereof a vertically slidable block I6 which is vertically adjusted by means of a screw I1 threaded through the bight II and 2 Claims.' i (ci. Y'ifi-47) formed with a reduced unthreaded stud I8` erigaging through an opening I9 formed in the block I3; `yA- nut 201s threaded on a reduced diameter threaded stud 2i carried by the stud I3, and the nut 2U rotatably engages in the opening 22 formed in the block I6.

`The block IB is formed with a T-shaped chan` nel 23 withinwhich a file 24 is adapted to engage; The lile 24 is secured in the channel 23 by means of 'set screws 25 so that the le 24 will be exposed on its lower "side to: the saw teeth of the chain sawl I5; The frame IIJ is clamped onto the stationaryfrarne I4 by means of opposed clamping screws 26 and 2l which engage through the lower portions of the sides I2 and I3 and preferably a spacerblock 23 is interposed between the side member i3`and-the frame I4 so that the chain saw I5 will be positioned substantially through the center of the le 24.

`A gaugingbar 29` is pivotally mounted on the block I6, being pivotally secured thereto by screws 33. The bar `29`is formed at its forward end with a slot-3| "throughwhich the cutting teeth 32 of the saw are adapted to loosely engage, and opposed thumb screws 33 are threaded through the bar 29 and as shown in Figure 7, are adapted to bear against the cutting teeth 32 so that any of such teeth which are set too deep may be forced inwardly so that they will be in alignment with the adjacent and remaining teeth.

In order to provide a means whereby the raker teeth 34 of the chain saw I5 may be gauged and led, I have provided a raker tooth gauge bar 35 which is adapted to be pivotally disposed on the screws 33. The raker gauge 35 is formed with a slot 35 within which a raker tooth is adapted to be positioned, and preferably the gauge member 35 is formed with a downwardly oifset intermediatel portion 3'I forming a file guide whereby a file may be reciprocated in the cross channel formed by the offset portion 31.

The forward and rear portions 38 and 39 of the gauge member 35 are adapted to rest on the tops of the cutting teeth so that the raker tooth disposed between two pairs of cutting teeth may be accurately gauged and sharpened.

In the use and operation of this device the frame I Il is secured to the frame I4 by the clamping bolts 26 and 21. The le 24 is secured in the le channel 23 by the set screws 25 and the block;

I6 may then be vertically adjusted so that the le- 24 will contact on its lower side with the cutting' teeth of the saw. The chain is operated in the normal manner over the chain guide I4 and as the saw teeth pass beneath the le they will be sharpened by the iile.

Where is is desired to gauge the cutting teeth, the bar 29 is mounted on the forward end of block I5 and the chain saw is then slowly moved through, the slot 3I and the teeth of the saw adjusted by' the channel formed by the offset portion 31.

the setting screws 32. After the cutting teeth have been properly set, the raker teeth may be sharpened by mounting the raker tooth gauge and file guide 35 on the bolts or screws 33. The lle used in sharpening the raker teeth is reciprocated cross-wise of the length of the chain saw within As the upper side of the offset portion 31 is coplanar with the lower sides of the end portions 3B and 39, the raker teeth may be led to a point where they are flush with the upper surface of the offset portion 31.

I do not mean to coniine myself to the exact details of construction herein disclosed, but claim all variations falling within the purview of the appended claims.

i What I claim is:

1. A chain saw Sharpener comprising an inverted U-shaped frame, clamping means securing said frame to the saw frame with the bight of the U-frame engaging over the saw frame, a vertically adjustable block engaging between the arms of said U-frame, said block having a T- shaped channel opening through the lower side thereof, a block adjusting screw threaded through the bight of said U-frame, a swivel connection between said screw and said block, means securing a file in said T-shaped channel whereby the saw teeth will engage the lower side of the fileI and a gauge means extending from the forward side of said U-frame, said gauge means comprising an elongated bar, means pivotally securing one end of said bar to said U-frame, the opposite end of said bar having a rearwardly extending slot, and a pair` of confronting screws threaded into said bar one on each side of said slot.

2. A chain saw Sharpener comprising an inverted U-shaped frame, clamping means securing said frame to the saw frame with the 'night of the U-frame engaging over the saw frame, a vertically adjustable block engaging between the arms of said U-frame, said block having a T- shaped channel opening through the lower side thereof, a block adjusting screw threaded through the bight of said U-frame, a swivel connection between said screw and said block, means securing a le in said T-shaped channel whereby the saw teeth will engage the lower side of the le, a gauge means extending from the forward side of said U-frame, said gauge means comprising an elongated bar, means pivotally securing one end of said bar to said U-frame, the opposite end of said bar having a. rearwardly extending slot, a pair of confronting screws threaded into said bar one on each side of said slot, said gauge means also including a combined raker tooth gauge andle guide and formed of a flat bar pivoted on said pair of screws, said hat bar having an intermediate offset portion forming an upper cross channel, said offset portion having an elongated openingthrough which the raker tooth is adapted to project, the upper side of said offset portion being in the same plan-e as the lower side of said flat bar adjacent said oiset portion.

BEN J ANIIN F. PITCHER.

REFERENCES CITED The following references are of record in the le of this patent:

UNITED STATES PATENTS Number Name Date 314,040 Mayer Mar. 17, 1885 2,339,509 Olson Jan. 18, 1944 2,415,137 Johnson Feb. 4, 1947 

